Question

x + y = 7 1/x + 1/y = 7/10

Answer 1

Resposta:

x+y=7

1/x+1/y=7/10

y+x/x*y=7/10

x+y/x*y=7/10

7/x*y=7/10

7(x*y)=70

x*y=70/7

x*y=10

Explicação passo-a-passo: